Network Management with Nagios
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1 Network Management with Nagios, wire.less.dk edit: October Sengerema Telecentre, Tanzania 1
2 Agenda What is it? Why use it? Installing Configuring Introduction to the Nagios web interface Lab & Exercises: Using Nagios monitor a server/gateway Lab & Exercises: Using plugins 2
3 Nagios What is it? Why use it? Nagios is a great network monitoring and management tool. It provides a valuable management dashboard. It's open source / free software. Similar systems and alternatives (partly overlapping with Nagios) include: Cacti, mrtg / rrdtools, nedi 3
4 Installing Prerequisites Apache 2 GCC compiler and development libraries GD development libraries Ubuntu: You can use apt-get to install these packages by running the following commands: > sudo apt-get install apache > sudo apt-get install build-essential 4
5 Installing Steps Get sources, currently: nagios tar.gz > wget > wget Depending on where you are, you might want to use a mirror closer to you! Start here: > tar -xzvf nagios-_._._.tar.gz Follow <nagios-dir>/html/docs/quickstartubuntu.html... or the guides for other linux distros, if you are on another one 5
6 Installing Creating user and group As root, run the following commands to create the nagios user and group: /usr/sbin/useradd -m nagios passwd nagios /usr/sbin/groupadd nagios /usr/sbin/usermod -G nagios nagios /usr/sbin/groupadd nagcmd /usr/sbin/usermod -G nagcmd nagios /usr/sbin/usermod -G nagcmd www-data 6
7 Installing Configuring and building Run the Nagios configure script, passing the name of the group you created earlier like so: >./configure --with-command-group=nagcmd Compile the Nagios source code. > make all Install binaries, init script, sample config files and set permissions on the external command directory. >make install >make install-init >make install-config > make install-commandmode View and edit config files in /usr/local/nagios/etc Install the Nagios web config file in the Apache conf.d directory. >make install-webconf Create a nagiosadmin account for logging into the Nagios web interface. Remember the password you assign to this account - you'll need it later. > htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin Restart Apache to make the new settings take effect. >/etc/init.d/apache2 reload 7
8 Web interface Introduction If everything went well, now go to: 8
9 Using Nagios Monitoring a server Task: Monitoring your gateway or main server 2 kinds of monitoring: Publicly available services Internal services (via ssh / plugins) Nagios relies on objects (hosts, groups, services,...) and their configuration Start by creating a host configuration Example config files are in /usr/local/nagios/etc/objects/ 9
10 Using Nagios Monitoring a server Example of a host definition define host{ use generic host ; Inherit default values from a template host_name wimbo ; The name we're giving to this host alias my own laptop ; A longer name associated with the host address ; IP address of the host hostgroups allhosts ; Host groups this host is associated with } 10
11 Using Nagios Monitoring a server Example of a service definition monitoring ssh on our gateway, using the check_ssh plugin define service{ use generic service ; Inherit default values from a template host_name wimbo service_description SSH check_command check_ssh } 11
12 Using Nagios Monitoring a server Whenever you are done adding a host or service, or have made any change, check the config by >/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg Remember that your new files need to be enabled in nagios.cfg, by a cfg_file or cfg_dir directive! And restart Nagios like so >/etc/init.d/nagios start 12
13 Using Nagios Becoming a Nagios expert The secret to using Nagios at its full potential is: Learn to work with configuration files (services) and plugins. There are many websites with plugin repositories. All documenation for Nagios is included in what you have installed on your system, so use it :) 13
14 That was it... Thank you! wire.less.dk edit: October Sources: 14
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